There are various stories afloat as to the immediate cause of the outbreak; one, that as a patrol passed the crowd hissed; another, that a cry was heard of "Viva Vittorio Emmanuele!" and a third, the Papal version, that on a young man of the name of Barberi being asked by a gendarme why he wore a violet flower on his coat, he answered rudely, and, on the officer trying to arrest him, his comrades pulled him away.

All stories agree, that the provocation to the police was given in the Piazza Colonna; and the disturbance, if any, was so trivial, that a friend of mine, who was on the spot at the time, perceived nothing of it, and only fancies he heard a murmur as the police rode by.

The provocation, whatever it was, was sufficient as a pretext for the premeditated outrage.

The _sbirri_ drew their swords, and slashing right and left, charged the dense crowds of men, women and children.

The word was given, and a band of some twenty Papal dragoons, who had been drawn up hard by at the Monte Citorio, waiting under arms for the signal, galloped down the Corso, clearing their way with drawn swords.